Gas-engine.



Nor 703,695. Patented my l, i902.

y A E. Bf. & L. s. cusHMAN.

GAS ENGINE.

(Application filed Oct. 25, 1901.) (No Model.) 2 Sheets-Sheet 2.k

l i f5 Z l i l l 46 f 1 5/ l 6 v /Q /3 4 20 f' 3 f 20Q o Y lo -2/ 4o m l /7 /9 l I /J' 54 a {5.zz/577777 vdlgesses /4/ SS-ZQYZQMQMS @2. i Y l l V c UNITED STATES PATENT OEEICE.

EVERETT B. OUSHMAN AND LESLIE S. OUkSI-IMAN, OF LINCOLN, NEBRASKA.

GAS-ENGINE.

SPECIFICATION forming partpf Letters Patent No. 703,695, dated July 1,1902. Application id october 25.1901. se'rilno. 79,971. ditmaal.;

To all whom it may concern:

Be it known that we, EVERETT B. CUSH- MAN and LESLIE S. CUSIIMAN, citizens of the United States, residing'at Lincoln, in the county of Lancaster and State of Nebraska, have invented a new and useful GasEngine, of which the following is a specication.

This invention relates to certain improvevments in two-cycle gas-engines, and is pargine as to permit of ready access to the inlet and escape ports for cleaning and repairs.

With these and other objects in view the invention consists in the novel construction and combination of parts hereinafter described, and illustrated in the accompanying drawings, and particularly pointed'out in the appended claims.

In the drawings, Figure 1 is a transverse sectional elevation on the line 1 1 of Fig. 2, illustrating a gas-engine constructed and arranged in accordance with the invention. Fig. 2 is a sectional elevation of the same on the line 2 2 of Fig. 1. Fig. 3 is a sectional plan view of the engine onthe line 3 3 of Fig. 2. Fig. 4 is a view of a portion of the mechanism illustrated in Fig.` 2, showing the clutching-hub in elevation. Fig. 5 is an elevation of a portion of the inlet-valve-operating mechamsm.

Similar numerals of reference are employed to designate corresponding parts throughout the various figures of the drawings.A

5 designates an air-cooledcylinder having the usual radiating ribs 6 and provided with a removable head 7, carryingaplug 8k for the support of the usual sparking terminals of an igniting-circuit.

The cylinder 5 is formed integral with a crank-case 9, substantially circular in form and provided with a removable side plate 10 and a removable end plate 11. On one side of the cylinder is placed an oil-cup to supply .below the saidports.

lubricant to the piston. Theexcessof oil accumulates on the crank-chamber and lubricates the crank-pin. The crank-casing and its cover-plate 10 are provided with bearings 12 for the reception and support of a crankshaft 13. ,The crank-shaftis connected bya rod 14 to a piston 15 of the usual trunk type, adapted to reciprocate inthecylinder, and the upper end of said piston is provided with a gas-delector 16, as is usual in engines of this class. The packing-rings'lof the piston are much wider than the gas entrance and escape ports in order to prevent catching in the ports during the reciprocations of the piston. l

In opposite sides of the cylinder are entrance and escape ports 17.. and 13, respec' tively, and `on the exterior ofthe cylinder are ribs or flanges 19, arranged onel above and one The peripheries of the ribs or flanges 19 are cut away or rabbeted,

as at 20, for the reception of a two-part ring 21, the adjacent'edges of the sections of the ring bein g provided with laterally-projecting lugs 2.2,through which maypass securing bolts or screws 23. v The periphery of the cylinder is further provided `with radially-,arranged ribs 24,-.arranged between the adjacent ends of the entrance and escape ports and between the upper and lowerlangesor ribs 2Q. These Vribs 24 divide the annular space between the cylinder and the ring.21.into two chambers, one of which basan outlet-port 25 for the products of combustion and the opposite chamber being connected to a gas-inlet pipe 26. This chamber is further connected by a verticallydisposed port 27 with the interior of the crankcasing,said crank-casing forming a compression-chamber for compressing the gases before their entranceinto the explosion-chambl'. Y r

At themouth of the inletepipe 26 isa valveseat 28 for a valve 29, the stem 3Q `of which passes through a suitable guide 31 and is provided at or neanpitsuouter end with an enlarged head or-collar32, between which and the adjacent end of the guide 31 is placed a compression-spring 33. In a chamber 34 is situated a valve-operating arm 35, said arm being carriedon a short shaft 36, adapted-to a suitable bearing 37, the opposite end of said IOO bearing of the crank-casing.

shaft being connected by a rocker-arm 38 and pitman 3f) to a crank-pin 40 on a crank-disk 41, carried by the crank-shaft 13.

In the operation of the engine the rotations of the crank-shaft will be imparted through the crank-disk 41 to the valve-operating arm 35, causing the opening of said valve for the admission of the gas during the upward movement of the piston. Ou the downward movement of the piston under the impulse of an explosion the gases within the crank-chamber will be compressed, and when the piston has reached its lowest point and has opened the inlet-port 17 the gases will rush into and fill the explosion-chamber. The upward movement of the piston will further compress the gases Within the explosion-chamber, the explosion being timed to take place at about the time the piston has completed its upward movement.

By removing the screws 23 the sectional ring 21 may be taken from the cylinder' for the purpose of cleaning or repairs to the valve or to remove any deposists of carbon from the ports 17 18.

On one end of the crank-shaft is secured the hub 43 of a fly-wheel 44, the web of said wheel having an inset portion for the reception of a grooved belt-wheel 45, over which maypass a suitable belt to transmit the power to the driving-wheel of the bicycle or such other point as may be desired. The beltwheel is cup-shaped in form and is mounted loosely on the shaft 13, the belt-wheel being provided with locking-pins 46, adapted to suitable openings 47 in the fly-wheel and serving as a means of locking the two together when it is desired to rotate the belt-wheel. On the bearing or hub of the crank-shaft casing is mounted a loose collar 49, provided with an operating-handle 50, extending to any suitable point, and in the periphery of said collar is formed an inclined slot 51, through which passes a pin 52, secured to the hub or The outer end of the collar 49 is provided with a peripheral flange 53, adapted to annular slots formed in the pins 4G.

In operating the clutch mechanism the handle 50 is turned and causes an inward or an outward movement of the collar 49, the locking-pin being either withdrawn from the openings in the fly-wheel to unlock the beltwheel or being forced into said openings to lock the fly-wheel in operative position. It will be noted that the clutching-sleeve lies wholly within the cup-shaped belt-wheel, the latter forming a housing or casing to protect the clutch from dirt and dust.

While the construction herein described and illustrated is the preferred form of thc device, it is obvious that vmany changes may be made in the form, proportions, size, and

minor details of construction without departing from the spirit or sacrificing any of the advantages of this invention.

I-Iaving thus described our invention, what we claim is- 1. The combination, in a two-cycle gas-engine, of a ported cylinder having outwardlyextending flanges at points above and below the cylinder-ports, a removable ring carried by said flanges, partitions dividing the space between the flanges and ring into a plurality of chambers, and gas inlet and escape ports for said chambers, substantially as specied.

2. The combination, in a two-cycle gas-engine, of a cylinderhaving ports and provided with upper and lower flanges, a ring adapted to said flanges, radial ribs formed on the cylinder between said flanges and serving to divide the annular space Within the ring into a plurality of chambers, and gas inlet and escape ports for said chambers, substantially as described.

3. The combination, in a two-cycle gas-engine, of a cylinder having ports, upper and lower ribs formed on the cylinder and having peripheral rabbets, a two-part ring mounted in said rabbets, ribs for dividing the space within the ring and flanges into a plurality of chambers, and gas inlet and escape ports for said chambers, substantially as specified.

4. The combination, in a two-cycle gas-engine, of a ported cylinder, a crank-casing, an- 95 nular flanges formed on the periphery of said cylinder at points above and below the cylinder-ports, one of said flanges being provided with an opening or port for communication with a gas-passage leading between the crankloc casingand the cylinder-ports, a sectional ring mounted on said flanges, and gas entrance and escape ports formed in said ring, substantially as specified.

5. The combination in agas-engine of a cyl- 105 inder, a crank-casing forming a compressionchamber for the explosive mixture, annular flanges formed on the periphery of the cylinder, a ring mounted on said flanges, ribs for dividing the space within the flanges and 1 1o ring into a plurality of chambers, piston-controlled ports extending between such chambers and the cylinder, an auxiliary port formed in the wall of the cylinder and leading between the crank-casing and one of said I I5 chambers, and a valved supply-port in communication with the chamber to which said auxiliary port is connected.

In testimony that we claim the foregoing as our own we have hereto aflixed our signa- 12o tures in the presence of two witnesses.

EVERET'I B. CUSIIMAN. LESLIE S. CUSHMAN. Witnesses:

G. W. BERGE, LoRETro Buisr. 

